IsoDecibel vs Construction Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IsoDecibel
This tool simplifies decibel calculations, allowing you to add, subtract, and average sound source levels. It's designed for ease of use and to provide an educational insight into acoustics.
- Add independent source levels
- Subtract independent source levels
- Calculate average of source levels
- Sum up to 20 source levels
- Educational insight into acoustics
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IsoDecibel is a simple and easy-to-use decibel calculator tool, for adding and subtracting independent source levels. IsoDecibel also provides the user with an option to calculate the average of source levels. The user has the ability to find the average and also the sum of up to 20 source levels. The calculator is designed to be easy-to-use, and also as an educational software that gives the user an insight into the field of Acoustics.
Construction Calc
This offline calculator helps construction professionals and DIYers quickly estimate materials for various projects. It supports imperial and metric units, and all calculations are stored locally for privacy. No internet connection is required.
- Offline material estimation
- Calculates 8 key materials
- Feet-Inch-Fraction input
- Imperial & Metric units
- Local data storage
- No subscriptions or ads
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The only offline calculator you need on the job site. No internet? No problem. Contractor Calc works 100% offline — so you get fast, accurate material estimates right when you need them. Estimate 8 key materials in seconds: Concrete (slabs, footings) Drywall (sheets with waste) Paint (gallons & liters) Roofing (squares with pitch) Gravel & Mulch (cubic yards/m³) Tile (tiles with cuts) Insulation (ft²/m²) Stairs (riser, tread, stringer) Built for pros, trusted by contractors: • Feet-Inch-Fraction Input — enter 12' 6" like you measure • Imperial & Metric — switch units in Settings • No subscriptions. No ads. No cloud. • All calculations stored locally — your data stays private Perfect for: • Residential & commercial contractors • Carpenters, framers, roofers, painters • DIYers tackling big projects • Estimators preparing bids Join thousands of builders who ditched spreadsheets and paper calculators. Get precise, professional results — every time.
Screenshots
Verdict
The clearest difference is in-app purchases: IsoDecibel at none against Construction Calc's 1. IsoDecibel also leads on iOS requirement (13.0 vs 15.6). Construction Calc's advantage is update cadence (every 3 months vs every 9 months). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Construction Calc sells 1 one-off in-app purchase. IsoDecibel asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for IsoDecibel against 5.0 for Construction Calc. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
IsoDecibel ships an update every 9 months, Construction Calc every 3 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | IsoDecibel | Construction Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 9 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 10 MB | 3 MB |
| Age rating | 4+ | 17+ |
| Developer | Emil Aerenlund | Konstantin Khoroshun |
Customer experience
IsoDecibel
Construction Calc
In-app purchases
IsoDecibel
No in-app purchases
Construction Calc
- Pro Features$0.99
Questions
Is IsoDecibel free?
Is Construction Calc free?
Which has better reviews, IsoDecibel or Construction Calc?
Do IsoDecibel or Construction Calc have ads?
Which is updated more often, IsoDecibel or Construction Calc?
Other comparisons
